April 2015

Instanceof vs. polimorphism

René Link
April 25, 2015June 9, 2016
Architecture & Design

An instanceof check is often an indication for misplaced source code. Some developer say that instanceof checks are ugly code, but there are reasons against instancof checks beyond a subjective feeling. In this blog I want to compare instanceof checks with polymorphism and discuss the downsides. This blog is intended to be used as a basis for desing decisions and discussions about code design. Instanceof motivations Everytime we write an instanceof check in java we are interessted in the capabilities of an object. We want to know if an object has specific features or methods or if it has not. This can also be implicit features that are derived from the type. In this case we have 2 options: Introduce… Read More »Instanceof vs. polimorphism

How to partially revert a commit in git?

René Link
April 19, 2015November 24, 2021
7 Comments
Git

Reverting commits in git is quite simple if you want to revert a whole commit. But how to partially revert a commit? In this blog I want to show you a safe approach to partially revert a commit.

Bugs love logging to hide

René Link
April 10, 2015June 9, 2016
Architecture & Design, Integration Tests, Testing, Unit Tests

A lot of projects run integration and unit tests, but often miss a little something – logging. When you use logging you often check if the log level is enabled or not before you log. But this means that you introduce a control flow statement that enables or disables some code. So if you miss to enable logging for your tests you let code untested and bugs love untested code, because they can hide there. But it is easy to remove this hiding places for bugs. Avoid log level checks if possible If you can avoid log level enabled checks, you avoid control flow statements and this means that you remove hiding… Read More »Bugs love logging to hide